Performance-Based Building Codes: A performance based building code specifies the amount of wind, snow, seismic, and other loads that the building must be able to withstand, and places limits on the resulting “effects” on the building. This method requires following a chart instead of performing engineering calculations. Prescriptive Building Codes: A prescriptive code requires that each component of a building meets minimum designs that are provided from a prescriptive table across different climate zones. Let's take a look at the difference between the two. ![]() Both approaches require that each element of a building (truss spacing, insulation R-value, etc) is built to a certain standard, but these requirements are enforced differently. As an engineered building system, post frame construction falls under the provision of the "performance-based" building codes. The standard residential "stick-frame" building system is subject to "prescriptive" building codes. This is traced back to building codes and structural design standards. ![]() For many traditional stick-frame builders, trusses spaced 8 feet apart seems unnatural, but thanks to the ingenuity of modern engineering it is a very common building design. With traditional stick-frame construction, the trusses are usually spaced 2 feet apart. ![]() Pole barn construction spaces the trusses 8 feet apart - or even up to 12 feet apart depending on the building design.
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